✏️ Parallel Lines & Transversals: Practice A (G-CO.C.9)

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Prove and apply theorems about lines and angles. Solve each problem.

1. Parallel lines cut by a transversal. Corresponding angle to 130° = ___

2. Same-side interior angle to 133° = ___

3. Alternate interior angles: (3x + 19)° and 79°. x = ___

4. Parallel lines cut by a transversal. Corresponding angle to 49° = ___

5. Same-side interior angle to 102° = ___

6. Alternate interior angles: (3x + 11)° and 71°. x = ___

7. Parallel lines cut by a transversal. Corresponding angle to 52° = ___

8. Same-side interior angle to 68° = ___

9. Alternate interior angles: (3x + 3)° and 63°. x = ___

10. Parallel lines cut by a transversal. Corresponding angle to 122° = ___

11. Same-side interior angle to 70° = ___

12. Alternate interior angles: (3x)° and 60°. x = ___

Answer key: 1) 130° · 2) 47° · 3) 20 · 4) 49° · 5) 78° · 6) 20 · 7) 52° · 8) 112° · 9) 20 · 10) 122° · 11) 110° · 12) 20

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Worksheets › Grade 10 Math (Geometry) › Parallel Lines & Transversals › Parallel Lines & Transversals

Grade 10 (ages 15–16)Numbers & mathsFree printable PDF

About this grade 10 worksheet

Free Grade 10 Geometry math worksheet (Common Core G-CO.C.9): parallel lines & transversals — twelve practice problems, with answer key. Skill: Prove and apply theorems about lines and angles. Level: Grade 10 — also suits Year 11 (UK).

For teachers: skills & standards

CCSS G-CO.C.9: Prove and apply theorems about lines and angles
Works as a morning-work page, a centre/station activity, homework or an early-finisher task.

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It is designed for Grade 10 (ages 15–16), but use it with any child who is ready.

What skills does it build?

Prove and apply theorems about lines and angles.

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More “Parallel Lines & Transversals” printables (g-co.c.9: prove and apply theorems about lines and angles)

Parallel Lines & Transversals: Practice B (G-CO.C.9) · Parallel Lines & Transversals: Mixed Practice & Reasoning (G-CO.C.9) · Parallel Lines & Transversals: Show Your Thinking (G-CO.C.9) · Parallel Lines & Transversals: Quick Check (G-CO.C.9)

All 5 parallel lines & transversals sheets → · Grade 10 Math (Geometry): all 10 skills → · All Common Core grades

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